"Well, we were just about to send out Save The Dates for our wedding in May when we got this little surprise Baby Carney is happening this summer and Patrick and I couldn’t be more excited!" she captioned the shot, which drew immediate adoration from fans.

"Are y'all trying to genetically engineer a perfect musician baby?" one wrote, while another noted "Will be a musical baby for sure...can you fit a drum kit in there?"

Branch has another child, a 12-year-old daughter named Owen Isabelle, from a relationship with her ex-husband, bass player Teddy Landau.

"Pat has said, 'I ­remember seeing you on MTV in the early 2000s and ­thinking you were really cute,'" she said "It’s like, why couldn’t we have just met each other in our 20s? We would have saved so much heartache!"